Minco
Tel: 763. 571.3121 • Fax: 763. 571.0927 • www.minco.com • Doc. #1116290(D)
9
Calibration
1.
Connect a power supply of 24 VDC and a digital milliammeter ( 5-1/2 digit preferred ) as
shown in the figure, or use a loop calibrator instead of the DC supply and milliammeter.
NOTE: Zero and Span resistance values are printed on the transmitter's label.
2.
Connect a resistance decade box with a resolution of at least .01 ohms to the input of the
transmitter. If unsure or concerned about the decade box's accuracy, measure the zero and
span resistance setting, using a known-accurate ohmmeter and record decade box settings
before connecting decade box to the transmitter.
3.
Set decade box resistance to simulate the 4 mA temperature.
4.
Adjust ZERO potentiometer on the transmitter until the meter reads 4 mA.
5.
Set decade box resistance to simulate the 20 mA temperature.
6.
Adjust SPAN potentiometer on the transmitter until the meter reads 20 mA.
7.
Repeat steps 3 - 7 until no further adjustment is necessary.
